Cannot See ASM Disks From Asmca when using udev rules on rhel 6

My Environment Detail
RHEL 6.7
GIv11.2.0..3.0
DBv11.2.0.3.0

SYMPTOMS
Oracle ASM new install can’t see ASM disks from asmca after running new install.Kfod does not discover the disks as per discovery path
But we can see the devices from operating system level.
CHANGES
Using udev rules instead of asmlib
CAUSE
When reusing a LUN, ASM may detect a previous disk header and refuse to reuse the disk.
SOLUTION
Clear the header by writing 25 MB of null, after clearing the header ASMCA and KFOD can able to see the devices
For example:
# dd if=/dev/zero of=<Device path> bs=1M count=25
NOTE: Please be cautious writing zero to devices, wrong device may end up in restoring the complete data
from backup.

Issue got resolved after followed this metalink doc 🙂

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s